Union Atlantic is Haslett's debut novel. The story follows several different characters: Doug Fanning, a self-made banker; Charlotte Graves, a retired school teacher; Charlotte's brother Henry, the President of the New York Federal Reserve bank; and Nate Fuller, an 18-year-old, infatuated with both Doug and Charlotte. It has been translated into twelve languages. It won a Lambda Literary Award for best work of gay men's fiction published in 2010.